Engineer's Thumb

Category

item

First appears

Book 2 · Ch. 10

Books

1

Engineer's Thumb first appears in The Adventures of Sherlock Holmes as the severed digit of engineer Victor Hatherley, whose horrific injury draws Sherlock Holmes into a case of industrial espionage and counterfeiting. Across the series, the thumb becomes a recurring symbol of the physical and moral costs of crime, referenced in later stories as a cautionary emblem of the dangers faced by those who assist Holmes. Its legacy evolves from a singular grotesque clue into a broader metaphor for the personal sacrifices demanded by the pursuit of justice.